| 摘要 |
PURPOSE:To realize a complete through characteristic at the time of non- adjustment by providing a third buffer amplifier whose output terminal is connected to second input terminals of first and second operational amplifiers. CONSTITUTION:A first variable amplifier 12 which amplifies the signal of the first input terminal of a first operational amplifier op1 and supplies it to a first buffer amplifier 13, a second variable amplifier 15 which amplifies the output signal of a second operational amplifier op2 and supplies it to a second buffer amplifier 16, and an adder 14 which adds outputs of first and second variable amplifiers 12 and 15 and supplies the output to the other end of a first capacity are provided. A third buffer amplifier 17 is provided which has the input terminal connected to an output terminal 20 of the second operational amplifier op2 and has the output terminal connected to second input terminals of first and second operational amplifiers op1 and op2. Thus, an active filter type signal adjusting circuit which has a complete through characteristic including the phase characteristic is obtained.
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